METHOD OF MANUFACTURING HIGH-DENSITY, INCLUDING OPTICAL, CERAMICS USING ELECTROPHORETIC DEPOSITION OF NANOPARTICLES Russian patent published in 2017 - IPC C04B35/626 C25D13/02 B82Y30/00 

FIELD: chemistry.

SUBSTANCE: in the method of manufacturing high-density, including optical, ceramics, weakly aggregated nanoparticles of oxides are obtained by the high-energy physical dispersion methods, for example, by the method of the laser material evaporation or the method of electric conductor explosion. A slurry is produced from the powder of the nanoparticles in the nonaqueous solvent with a concentration of 0.1 to 10 wt %, treated with ultrasound, and compacts are formed after centrifugation by the electrophoretic deposition (EPD) with the electric field intensity, adjustable from 50 to 300 V/cm, and the current density selectable from 0.05 mA/cm² to 5 mA/cm², for 1 to 200 min depending on the desired thickness of the workpiece. The resulting compacts are dried and sintered. For the EPD compacts with a thickness up to several millimetres, a pulse voltage with a change of polarity is used, wherein the reverse polarity voltage is not more than 20% of the direct polarity voltage, and the pulse duration is adjustable from 1 ms to 10 s.

EFFECT: reduction of defectiveness of compacts and ceramics with the exclusion of the expensive press equipment use.

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